/****************************************************************************
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** Copyright (C) 2019 Luxoft Sweden AB
** Copyright (C) 2018 Pelagicore AG
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** This file is part of the Qt Application Manager.
**
** $QT_BEGIN_LICENSE:LGPL-QTAS$
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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** SPDX-License-Identifier: LGPL-3.0
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****************************************************************************/

#pragma once

#include <QAtomicInteger>
#include <QObject>
#include <QPointer>
#include <QThread>
#include <QVariant>

#include <QtAppManCommon/global.h>
#include <QtAppManManager/amnamespace.h>
#include <QtAppManManager/application.h>
#include <QtAppManMonitor/processreader.h>

QT_BEGIN_NAMESPACE_AM

// It's assumed that all ProcessStatus instances are created from the same thread (most likely the main one).
class ProcessStatus : public QObject
{
    Q_OBJECT
    Q_CLASSINFO("AM-QmlType", "QtApplicationManager.SystemUI/ProcessStatus 2.0")
    Q_PROPERTY(QString applicationId READ applicationId WRITE setApplicationId NOTIFY applicationIdChanged)
    Q_PROPERTY(qint64 processId READ processId NOTIFY processIdChanged)
    Q_PROPERTY(qreal cpuLoad READ cpuLoad NOTIFY cpuLoadChanged)
    Q_PROPERTY(QVariantMap memoryVirtual READ memoryVirtual NOTIFY memoryReportingChanged)
    Q_PROPERTY(QVariantMap memoryRss READ memoryRss NOTIFY memoryReportingChanged)
    Q_PROPERTY(QVariantMap memoryPss READ memoryPss NOTIFY memoryReportingChanged)
    Q_PROPERTY(QStringList roleNames READ roleNames CONSTANT)
public:
    ProcessStatus(QObject *parent = nullptr);

    QStringList roleNames() const;

    Q_INVOKABLE void update();

    qint64 processId() const;

    QString applicationId() const;
    void setApplicationId(const QString &appId);

    qreal cpuLoad();
    QVariantMap memoryVirtual() const;
    QVariantMap memoryRss() const;
    QVariantMap memoryPss() const;

signals:
    void applicationIdChanged(const QString &applicationId);
    void processIdChanged(qint64 processId);
    void cpuLoadChanged();
    void memoryReportingChanged(const QVariantMap &memoryVirtual, const QVariantMap &memoryRss,
                                                                  const QVariantMap &memoryPss);

private slots:
    void onRunStateChanged(Am::RunState state);

private:
    void fetchMemoryReadings();
    void determinePid();

    QString m_appId;
    qint64 m_pid = 0;

    QVariantMap m_memoryVirtual;
    QVariantMap m_memoryRss;
    QVariantMap m_memoryPss;

    QPointer<Application> m_application;

    bool m_pendingUpdate = false;
    QScopedPointer<ProcessReader> m_reader;
    static QThread *m_workerThread;
};

QT_END_NAMESPACE_AM
